JP2002289429A - Electromagnetic actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a coil and a movable plunger and, at the same time, to prevent the falling of the plunger in an electromagnetic actuator. SOLUTION: The electromagnetic actuator is provided with a housing 1, a bobbin 2, the coil 3, a fixed core 5, the movable plunger 6, a returning spring 25, a joint member 24 which is coupled with the outer end section of the movable plunger 6 protruded outward from the housing 1, and a coil cover 7a which is attached to the housing 1 in a state where the cover 7a covers the coil 3. A plunger cover 7b which covers the outer end section of the movable plunger 6, and a stopper arm 45 which is engaged with the joint member 24 to control the outward movement of the joint member 24, are integrally formed with the coil cover 7a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic housing, a bobbin disposed in the housing, a coil wound on the bobbin, a fixed core surrounded by the bobbin and fixed to the housing, A movable plunger that is attracted to the fixed core by excitation of the coil, a return spring that biases the movable plunger in a direction away from the fixed core, and an outer end of the movable plunger that protrudes outside the housing. The present invention relates to an electromagnetic actuator including a joint member and a coil cover that covers the coil and is attached to the housing.

[0002]

2. Description of the Related Art Such an electromagnetic actuator is already known, for example, as disclosed in Japanese Patent Application Laid-Open No. 9-92528.

[0003]

In such a conventional electromagnetic actuator, since the movable plunger is not provided with a retaining means, the movable plunger falls off during handling such as transportation in a non-coupled state with the driven equipment. There was a risk of doing so.

The present invention has been made in view of such circumstances, and has as its object to provide the above-mentioned electromagnetic actuator which can easily prevent the movable plunger from falling off.

[0005]

In order to achieve the above object, the present invention provides a magnetic material housing, a bobbin disposed in the housing, a coil wound on the bobbin,
A fixed core surrounded by the bobbin and fixed to the housing, a movable plunger attracted to the fixed core by excitation of the coil, a return spring for urging the movable plunger away from the fixed core, the movable spring; An electromagnetic actuator comprising a joint member coupled to an outer end of a plunger projecting out of a housing, and a coil cover covering the coil and attached to the housing, wherein an outer periphery of an outer end of the movable plunger is provided on the coil cover. The first feature is that a plunger cover that covers the joint member and a stopper arm that engages with the joint member and restricts outward movement of the joint member are integrally formed to form a cover assembly.

According to the first feature, the coil assembly and the movable plunger can be covered by the cover assembly to protect them from intrusion of dust and contact with other objects, and prevent the movable plunger from coming off. Thus, the durability and handleability of the electromagnetic actuator can be improved. Moreover, the integral cover assembly does not increase the number of parts.

According to the present invention, in addition to the first feature, the housing includes a first end wall supporting the fixed core, a second end wall penetrated by the movable plunger, and a first end wall.
And a side wall disposed on one side of the coil so as to connect between the second end walls, and a fitting mounting portion fitted and mounted on the second end wall integrally with the cover assembly. A second feature of the present invention is that molded and provided with a retaining means between the fitting attachment portion and the housing for preventing the fitting attachment portion from being detached from the second end wall.

According to the second feature, the cover assembly can be easily attached to the housing by utilizing the second end wall of the housing.

Further, in addition to the second feature, the present invention provides, as the retaining means, a flange of the bobbin fitted to an inner periphery of the coil cover and a guide for guiding sliding of the movable plunger. A guide sleeve fitted to the inner periphery of the bobbin is inserted into the second end wall and the bobbin and is fixed to the fixed core, and the guide sleeve and the bobbin separate the fitting attachment portion from the second end wall. The third feature is to prevent the above.

According to the third feature, not only can the bobbin be fixed to the housing by effectively utilizing the fixed core and the guide sleeve, but also the detachment of the fitting attachment portion of the cover assembly from the second end wall. Can be prevented, and therefore
Since a special fixing member for preventing the fitting attachment portion from being detached from the second end wall is unnecessary, the structure can be simplified and the assembling property can be improved.

Further, in addition to the second or third feature, the present invention further comprises a mounting boss used for screwing the housing to the support, and the mounting boss is formed on the side wall so as to protrude toward the inner surface thereof. A fourth feature is that an escape hole for receiving the projecting end of the mounting boss is provided in the coil cover.

According to the fourth feature, a screw hole longer than the thickness of the housing can be formed in the mounting boss, so that the screw can be firmly fixed to the support. In addition, since the projecting end of the mounting boss is received in the escape hole of the coil cover, the coil cover can be overlaid on the side wall without interference by the mounting boss, which can contribute to the downsizing of the electromagnetic actuator.

Further, in the present invention, in addition to the fourth feature, a fifth feature is that the relief hole and the fitting attachment portion are formed in parallel with each other.

According to the fifth feature, when the cover assembly is molded with synthetic resin, the molding can be easily performed by setting the same direction of pulling out the molding die with respect to the fitting attachment portion and the relief hole. .

Still further, according to the present invention, in addition to any one of the first to fifth features, a coupler having a coupler terminal connected to the coil is connected to an end of the bobbin opposite to the joint member. This is a sixth feature.

According to the sixth feature, the distance between the coupler and the joint member can be set large, and the interference between the external lead wire connected to the coupler terminal and the joint member can be reliably prevented. .

Furthermore, in the present invention, in addition to the sixth feature, a seventh feature is that a coupler holding portion fitted to the base of the coupler is formed integrally with the coil cover.

According to the seventh feature, the positioning and reinforcement of the coupler can be easily performed by the coupler holding portion integrated with the coil cover.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIG. 1 is a longitudinal sectional plan view of an electromagnetic actuator according to the present invention, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG.
4, FIG. 4 is a view from arrow 4 in FIG. 1, and FIG.
6 is a perspective view of the housing of the electromagnetic actuator, FIG. 7 is a perspective view of one end of a cover assembly of the electromagnetic actuator, and FIG. 8 is a view of the other end of the cover assembly. FIG. 9 is a perspective view and FIG. 9 is an explanatory view of an assembling process of the electromagnetic actuator.

As shown in FIGS. 1 to 6, the electromagnetic actuator A includes a housing 1, a bobbin 2, a coil 3, a guide sleeve 4, a fixed core 5, a movable plunger 6, and a cover assembly 7 as main components.

In FIG. 1 and FIG.
It is formed by pressing a plurality of magnetic steel plates into a U-shape and includes first and second end walls 1a and 1b before and after facing each other and a side wall 1c connecting these end walls. Wall 1
The both side edges of “a” are closer to the inside than both side edges of the side wall 1c, and the width of the first end wall 1a is set smaller than the width of the side wall 1c. A positioning protrusion 8 and a mounting boss 9 are provided on the side wall 1c, and the electromagnetic actuator A is fixed to an appropriate position of the support S by a bolt 10 using these. The first end wall 1a of the housing 1 is provided with a small-diameter support hole 11 at the center thereof. The second end wall 1b has a large-diameter support hole 1 coaxially aligned with the small-diameter support hole 11.
2 is drilled. The mounting boss 9 is formed so as to protrude toward the inner surface of the side wall 1c by burring from the outside of the side wall 1c. Therefore, the mounting boss 9
A screw hole whose effective length is sufficiently longer than the thickness of the side wall 1c can be formed, and the screwing to the support S can be performed firmly.

2 and 3, the bobbin 2 is made of a synthetic resin and has a cylinder 2c around which the coil 3 is wound, a thick flange 2a connected to one end of the cylinder 2c, and a bobbin 2c. And a thin flange 2b connected to the end. The inner diameter of the cylinder 2c is set to be substantially the same as that of the large-diameter support hole 12,
The distance between the outer surfaces of the two flanges 2a, 2b is set substantially equal to the distance between the inner surfaces of both end walls 1a, 1b of the housing 1.

A coupler housing 13 extending axially outward from the outer peripheral edge of the thick flange 2a is integrally connected to the thick flange 2a. The coupler housing 13 is formed integrally with the bobbin 2. Therefore, if the bobbin 2 is inserted between both end walls 1a and 1b of the housing 1, the thick flange 2a of the bobbin 2 is provided on the inner surface of the first end wall 1a and the thin flange 2b is provided on the inner surface of the second end wall 1b. The bobbin 2 is in close contact with it, and the axial movement of the bobbin 2 is prevented. At that time, bobbin 2
Are arranged such that the coupler housing 13 is located on one side or the other side of the first end wall 1a according to the use state of the electromagnetic actuator A (see FIGS. 3 and 4).

In the housing 1, as described above, the width of the first end wall 1a is set smaller than the width of the side wall 1c. Therefore, one side of the first end wall 1a is reduced by the reduced width. Alternatively, the amount of lateral protrusion of the coupler housing 13 disposed adjacent to the other side from the housing 1 is reduced, and the electromagnetic actuator A can be made compact.

A guide sleeve 4 made of non-magnetic metal is fitted in the large-diameter support hole 12 of the cylinder 2c and the second end wall 1b of the bobbin 2, and a fixed core 5 and a movable plunger 6 are arranged in the guide sleeve 4. The movable plunger 6 is provided with the guide sleeve 4
It can slide inside.

The fixed core 5 has a cylindrical shape. An annular groove 19 is formed on the outer periphery of one end, and a small shaft 20 is formed on one end surface thereof. Further, at the other end, a tapered hole 21 opened on the end face and a concave portion 22 connected to the small-diameter end of the tapered hole 21 are provided. The fixed core 5 is tightly fitted to the inner peripheral surface at one end of the guide sleeve 4, and by caulking several portions of the sleeve 4 corresponding to the annular groove 19,
Several caulking projections 23 raised from the inner peripheral surface of the sleeve 4 are locked in the annular groove 19. By performing such a caulking connection, the caulking projections 23 can be formed with a relatively light caulking force, the distortion of the guide sleeve 4 and the fixed core 5 can be prevented, and the coaxiality between the two can be secured. .

The fixed core 5 is disposed so that its small shaft 20 is inserted into the small-diameter support hole 11 of the first end wall 1a of the housing 1 and is in close contact with the inner surface of the end wall 1a. The end is formed in the enlarged portion 20a by swaging. Thus, the fixed core 5 is fixed to the first end wall 1a of the housing 1. Therefore, the guide sleeve 4 is fixed to the housing 1 via the fixed core 5.

The other end of the guide sleeve 4 is
Is inserted into the large-diameter support hole 12 of the second end wall 1b.
It protrudes long outward from the second end wall 1b. Due to this projection, the support span of the guide sleeve 4 with respect to the movable plunger 6 is increased, and the inclination of the movable plunger 6 can be suppressed as much as possible.

The movable plunger 6 has a tapered shaft portion 6a corresponding to the tapered hole 21 of the fixed core 5 at an inner end. A small shaft 32 having an enlarged head 32a protrudes from an end face of the tapered shaft portion 6a, and an elastic stopper 33 made of rubber or the like is mounted on the small shaft 32. The elastic stopper 33 comes into contact with the bottom surface of the concave portion 22 of the fixed core 5 in order to regulate the approach distance of the movable plunger 6 to the fixed core 5 at a constant level. Absorbed by compressive deformation.

A joint member 24 is attached to the outer end of the movable plunger 6 protruding from the guide sleeve 4. The joint member 24 is made of a synthetic resin and has a cylindrical portion 24a.
And an eyeball portion 24c protruding from the end wall 24b. The cylindrical portion 24a is press-fitted to the outer peripheral surface of the outer end of the movable plunger 6, and an actuated member 26 is connected to the eyeball portion 24c. It has become. The cylindrical portion 24a
Are formed integrally with a plurality of horizontal holes 27 and a locking claw 28 having a claw at the tip facing the horizontal hole 27 and bent inward in the radial direction. When the outer end surface of the movable plunger 6 press-fitted into 24a comes into contact with the end wall 24b, the movable plunger 6 engages with the annular groove 29 on the outer periphery of the movable plunger 6 with its own elastic force. Therefore, even if the press-fit connection between the cylindrical portion 24a and the movable plunger 6 becomes loose, the detachment of the joint member 24 can be prevented.

Further, the cylindrical portion 24a of the joint member 24
The tapered portion 30 and the tapered portion 3
A circular flange 31 rising from the large-diameter end (see FIG. 5)
Are formed. A return spring 25 formed of a tapered coil spring is contracted between the flange 31 and the second end wall 1b of the housing 1, and the movable plunger 6 is urged in a direction away from the fixed core 5 by the spring force. .

When the coil 3 is energized and excited, the magnetic flux flowing through the fixed core 5 and the movable plunger 6 through the housing 1 generates an attractive force between the two cores 5 and 6, and the movable plunger 6 The return spring 25 is compressed and moved forward toward the fixed core 5 from the solid line position in FIG.

From the thick flange 2 a of the bobbin 2 to the coupler housing 13, a pair of coupler terminals 34 connected to both ends of the coil 3 are mode-coupled. A noise preventing diode 38 is connected between the two coupler terminals 34, and a concave portion 39 for accommodating the diode 38 is formed on the outer end surface of the thick flange 2a. As a result, the diode 38 can be protected from contact with other objects and intrusion of dust and the like.

A coupler 35 is constituted by the coupler housing 13 and a pair of coupler terminals 38, and a power supply side coupler (not shown) is connected to the coupler 35.

The coupler 35 is provided at the end of the bobbin 2 opposite to the joint member 24, that is, at the thick flange 2a.
It will be installed continuously. By doing so, the distance between the coupler 35 and the joint member 24 can be set large, and interference between the lead wire of the power supply-side coupler and the joint member 24 can be reliably prevented.

The housing 1 is provided with a cover assembly 7 made of synthetic resin for covering the coil 3 and a portion of the movable plunger 6 exposed outside the housing 1. The cover assembly 7 will be described with reference to FIGS.

The cover assembly 7 includes a coil cover 7 a for covering the entire outer peripheral surface of the coil 3, and a plunger cover 7 for covering a portion of the movable plunger 6 exposed outside the housing 1.
b and a common fitting portion 7c for integrally connecting the covers 7a and 7b.

The coil cover 7a has a rectangular tube shape with a rectangular cross section, and is disposed between the first and second end walls 1a and 1b of the housing 1 while covering the outer periphery of the coil 3.
At this time, the long side of the rectangular cross section of the coil cover 7a is arranged parallel to the side wall 1c of the housing 1. A positioning groove 40 having an arcuate cross-section is formed in the inner surface of the opposite side wall on the long side of the coil cover 7a, with which a part of the outer peripheral surface of both flanges 2a, 2b of the bobbin 2 engages.

On the opposite side of the plunger cover 7b from the coil cover 7a, a coupler holding portion 41 having a U-shaped cross section which is fitted to the base of the coupler housing 13 is integrally formed on one short side of the rectangular cross section. It is formed.

Further, a pair of escape holes 42 are formed in both side walls on the long side of the coil cover 7a. Each of the escape holes 42 has a long side wall on the side wall 1 of the housing 1.
c, when mounted on the inner surface, the mounting boss 9 of the side wall 1c.
Are disposed so as to be able to receive the protruding end portion. Therefore,
The position of the coupler holding portion 41 is changed to the first end wall 1a of the housing 1.
Both sides on the long side of the coil cover 7a can be overlapped on the inner surface of the side wall 1c of the housing 1 without being interfered by the mounting boss 9 so that the left side and the right side can be selected. . Thus, only by changing the mounting position of the coil cover 7a with respect to the housing 1, the first use mode in which the coupler 35 is arranged on one side of the housing 1 and the second use mode in which the coupler 35 is arranged on the other side can be selected. Therefore, two types of electromagnetic actuators A having different positions of the coupler 35 without increasing the number of parts
Can be provided at a low cost.

Each of the escape holes 42 and the fitting attachment portion 7c are arranged such that their axes are parallel to each other. By doing so, when molding the cover assembly 7 made of synthetic resin, the molding die can be easily removed from the fitting / attachment portion 7c and each of the clearance holes 42 with the same removal direction.

On the other hand, the plunger cover 7b has a cylindrical shape and is arranged so as to cover a portion of the movable plunger 6 exposed outside the housing 1. Fitting attachment part 7c
Has a hollow portion 43 open at both ends corresponding to the cross-sectional shape of the second end wall 1 b of the housing 1.
3 is fitted with the second end wall 1b.

The movable plunger 6 engages with the flange 31 of the joint member 24 on the plunger cover 7b.
Arm 45 for preventing the release from the guide sleeve 4
Is constituted by a part of the peripheral wall of the cover 7b. At this time, a pair of slits 46 adjacent to both sides of the stopper arm 45 are formed in the plunger cover 7b.
Is cut from the outer end side. Thereby, each stopper arm 4
5, the plunger cover 7b is provided with elasticity in the radial direction. Also, the cutting depth of the slit 46 is the stopper arm 4.
5 to determine the effective length.

The stopper arm 45 is connected to the plunger cover 7b.
Are provided at two locations opposing each other on the diameter line, and the ends of the flanges 31 are provided with the stopper arms 45 in a free state.
An inward hook 47 that can be engaged with the outer end face of the body is integrally formed. A slope 47a is formed at the outer end of the hook 47. The slope 47a is connected to the joint member 24.
When the flange 31 is inserted into the plunger cover 7b,
As a result, the stopper arm 45 is deflected radially outward.

When assembling the electromagnetic actuator A, as shown in FIG. 9A, the bobbin 2 with the coil 3 is inserted into the coil cover 7a of the cover assembly 7, and the coupler housing 13 is provided. Is fitted to the coupler holding portion 41. At this time, the flanges 2a and 2b of the bobbin 2 are engaged with the positioning grooves 40 on the inner wall of the coil cover 7a, so that the bobbin 2 and the coil cover 7a are concentric. When the coupler holding portion 41 is fitted to the base of the coupler housing 13, the coupler 35
Positioning and reinforcement can be performed easily and reliably.

Next, as shown in FIG. 9B, the second end wall 1b of the housing 1 is fitted to the fitting mounting portion 7c of the cover assembly 7. At this time, depending on which side of the two openings of the fitting attachment portion 7c the second end wall 1b is fitted from,
As shown in FIG.
Above (solid line position) or below (chain line position).

Subsequently, as shown in FIG. 9C, the guide sleeve 4 caulked to the fixed core 5 is inserted into the large-diameter support hole 12 of the housing 1 and the cylinder 2c of the bobbin 2, and the fixed core 5 is fixed. 5 is inserted into the small-diameter support hole 11 of the housing 1. Then, as shown in FIG. 9 (D), the outer end of the small shaft 20 is swaged to form the enlarged portion 20a. Thus, the fixed core 5 and the guide sleeve 4 are fixed to the housing 1. As a result, the first and second end walls 1a, 1 of the bobbin 2
b, and the detachment of the fitting attachment 7c of the cover assembly 7 from the second end wall 1b is prevented. Therefore, a special fixing member for preventing the fitting and attaching portion 7c from being detached from the second end wall 1b is unnecessary, so that the structure can be simplified and the assembling property can be improved.

Finally, as shown in FIG.
Then, the movable plunger 6 equipped with the joint member 24 is inserted into the guide sleeve 4. In this case, when the joint member 24 is pushed into the plunger cover 7b, the flange 31 slides on the slopes 47a of the pair of stopper arms 45 of the plunger cover 7b.
Since the hook 47 is removed to the outside while bending 5, the flange 31 can pass smoothly in front of the hook 47. When the pushing force is released from the movable plunger 6 after the passage, the movable plunger 6 is retracted by the return force of the return spring 25, but the outer end surfaces of the flange 31 of the joint member 24 engage with the hooks 47 of both stopper arms 45. This prevents the movable plunger 6 from coming out of the guide sleeve 4.

Thus, the coil 3 and the plunger 6
It is covered with a coil cover 7a and a plunger cover 7b which constitute the integral cover assembly 7, respectively, and is protected from intrusion of dust and contact with other objects. Moreover, the movable plunger 6 can be easily prevented from coming out of the guide sleeve 4 by using the plunger cover 7b. Therefore, the movable plunger 6 does not fall off during transportation or other handling of the electromagnetic actuator A, and the handling becomes easy.

At the time of assembling, the flange 31 can be engaged with the hooks 47 of the both stopper arms 45 simply by inserting the joint member 24 into the plunger cover 7b at random. Moreover, since the flange 31 is circular, the engagement between the flange 31 of the joint member 24 and the hook 47 of the stopper arm 45 can always be reliably performed at any rotational position of the movable plunger 6, and the assemblability is extremely high. It will be good. Further, when the electromagnetic actuator A is disassembled, each hook 47 is disengaged from the flange 31 of the joint member 24 only by bending the stopper arms 45 outward against their elastic force, and the movable plunger 6 is guided by the guide sleeve. 4
Can be pulled out from the machine and the maintenance is good.

Further, hooks 47 of both stopper arms 45 are
Since it engages with both sides of the flange 31 which are opposed to each other in a diameter line, a stable engagement state with the flange 31 can be always obtained.

Further, the flange 31 of the joint member 24 supports the movable end of the return spring 25 on its inner surface,
Since the outer side surface performs two different functions of engaging with the hook 47 of the stopper arm 45, it can contribute to the simplification and compactness of the structure of the electromagnetic actuator A.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist of the present invention. For example, fixed core and guide sleeve
Instead of caulking, they can be joined by welding, brazing, or the like.

[0055]

As described above, according to the first feature of the present invention, a housing made of a magnetic material, a bobbin provided in the housing, a coil wound around the bobbin, and a coil surrounded by the bobbin. A fixed core fixed to the housing, a movable plunger attracted to the fixed core by excitation of the coil, a return spring for urging the movable plunger in a direction away from the fixed core,
An electromagnetic actuator, comprising: a joint member coupled to an outer end protruding out of a housing; and a coil cover covering the coil and attached to the housing, wherein the coil cover covers an outer periphery of an outer end of the movable plunger. Since the cover and the stopper arm that engages with the joint member and regulates the outward movement of the joint member are integrally formed to form the cover assembly, the cover assembly covers the coil and the movable plunger. , Can be protected from intrusion of dust and contact with other objects, and at the same time, the movable plunger can be prevented from coming out of the guide sleeve, and the durability and handleability of the electromagnetic actuator can be improved. Moreover, the integral cover assembly does not increase the number of parts.

According to a second aspect of the present invention, in addition to the first aspect, the housing is provided with a first end wall for supporting the fixed core and a second end wall penetrated by the movable plunger.
An end wall and a side wall disposed on one side of the coil so as to connect the first and second end walls to each other.
A fitting fitting portion fitted to and attached to the end wall is integrally formed with the cover assembly, and a detachment between the fitting fitting portion and the housing for preventing the fitting fitting portion from being detached from the second end wall. The provision of the stop means makes it possible to easily attach the cover assembly to the housing using the second end wall of the housing.

According to a third feature of the present invention, the second
In addition to the above features, as the retaining means, a guide fitted on the inner periphery of the bobbin to guide the sliding of the movable plunger by fitting a flange of the bobbin on the inner periphery of the coil cover. Since the sleeve is inserted into the second end wall and the bobbin and is fixed to the fixed core, the guide sleeve and the bobbin prevent the fitting attachment portion from being detached from the second end wall. In addition to the effective use of the guide sleeve, not only can the bobbin be fixed to the housing, but also the detachment of the fitting mounting portion of the cover assembly from the second end wall can be prevented. Since a special fixing member for preventing detachment from the second end wall is not required, the structure can be simplified and the assembling property can be improved.

According to a fourth feature of the present invention,
In addition to the second or third feature, a mounting boss used for screwing the housing to the support is formed on the side wall so as to protrude toward the inner surface thereof, while receiving a protruding end of the mounting boss. Since the relief hole is provided in the coil cover, a screw hole longer than the thickness of the housing can be formed in the mounting boss, and the screw can be firmly fixed to the support. In addition, since the projecting end of the mounting boss is received in the escape hole of the coil cover, the coil cover can be overlapped on the side wall without interference by the mounting boss, which can contribute to the compactness of the electromagnetic actuator.

According to a fifth feature of the present invention,
In addition to the fourth feature, since the relief hole and the fitting attachment portion are formed in parallel with each other, when the cover assembly is molded with synthetic resin, the direction in which the molding die is removed with respect to the fitting attachment portion and the relief hole. And the molding can be easily performed.

Further, according to a sixth aspect of the present invention,
In addition to any one of the first to fifth features, a coupler having a coupler terminal connected to the coil is provided at an end of the bobbin opposite to the joint member. Can be set large, and interference between the external lead wire connected to the coupler terminal and the joint member can be reliably prevented.

According to a seventh feature of the present invention,
In addition to the sixth feature, since the coupler holding portion to be fitted to the base of the coupler is formed integrally with the coil cover, positioning and reinforcement of the coupler can be easily performed by the coupler holding portion integrated with the coil cover. Can be.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional plan view of an electromagnetic actuator according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a view taken in the direction of arrow 3 in FIG. 1;

FIG. 4 is a view taken in the direction of arrow 4 in FIG. 1;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 1;

FIG. 6 is a perspective view of a housing of the electromagnetic actuator.

FIG. 7 is a perspective view of one end of a cover assembly of the electromagnetic actuator.

FIG. 8 is a perspective view of the cover assembly as viewed from the other end.

FIG. 9 is an explanatory view of an assembling process of the electromagnetic actuator.

[Explanation of symbols]

 A: Electromagnetic actuator 1: Housing 1a: First end wall 1b: Second end wall 1c: Side wall 2: Bobbin 2a, 2b · · · · Bobbin flange 3 · · · · · · coil 5 · · · · · · fixed core 6 · · · · · movable plunger 7 · · · · · cover assembly 7a · · · · coil cover 7b · · · · plunger Cover 7c Fitting mounting part 9 Mounting boss 24 Joint member 25 Return spring 34 Coupler terminal 35 Coupler 41 Coupler holding part 42 ··· Escape hole 45 ··· Stopper arm

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5E048 AD04 CB05 CB07 5H633 BB07 BB10 GG02 GG04 GG05 GG09 GG12 GG30 HH21 HH22 JA02 JA05 JB03 JB04

Claims (7)

[Claims] 1. A housing (1) made of a magnetic material, a bobbin (2) provided in the housing (1), a coil (3) wound on the bobbin (2), and a bobbin (2). The fixed plunger (5) which is surrounded and fixed to the housing (1), the movable plunger (6) which is attracted to the fixed core (5) by excitation of the coil (3), and the movable plunger (6) is A return spring (25) biasing in a direction away from the fixed core (5), a joint member (24) coupled to an outer end of the movable plunger (6) projecting out of the housing (1), and Coil (3)
An electromagnetic actuator having a coil cover (7a) attached to the housing (1) so as to cover
A plunger cover (7b) that covers the outer periphery of the outer end of the movable plunger (6) on the coil cover (7a).
And a stopper arm (4) which engages with the joint member (24) to restrict outward movement of the joint member (24).
And (5) are integrally formed to form a cover assembly (7). 2. The electromagnetic actuator according to claim 1, wherein the housing (1) is penetrated by a first end wall (1a) supporting the fixed core (5) and a movable plunger (6). A second end wall (1b) and a side wall (1c) arranged on one side of the coil (3) so as to connect between the first and second end walls (1a, 1b);
A fitting attachment part (7c) fitted and attached to the second end wall (1b) is integrally formed with the cover assembly (7), and the fitting attachment part (7c) and the housing (1) are formed. The second end wall (1b) of the fitting portion (7c) between them
An electromagnetic actuator, characterized in that it is provided with a retaining means for preventing detachment from the device. 3. The electromagnetic actuator according to claim 2, wherein the flanges (2a, 2b) of the bobbin (2) are fitted to the inner periphery of the coil cover (7a) as the retaining means, and the movable member is movable. A guide sleeve (4) fitted to the inner periphery of the bobbin (2) for guiding the sliding of the plunger (6) is inserted into the second end wall (1b) and the bobbin (2), and is fixed. The guide sleeve (4) and the bobbin (2) prevent the fitting attachment part (7c) from being detached from the second end wall (1b) by the guide sleeve (4) and the bobbin (2). , Electromagnetic actuator. 4. The electromagnetic actuator according to claim 2, wherein a mounting boss (9) used for screwing the housing (1) to a support (S) is attached to the side wall (1c). An electromagnetic actuator, wherein the coil cover (7a) is provided with a clearance hole (42) for receiving the protruding end of the mounting boss (9) while being formed so as to protrude toward the inner surface side. 5. An electromagnetic actuator according to claim 4, wherein said clearance hole and said fitting mounting portion are provided.
An electromagnetic actuator, wherein c) is formed parallel to each other. 6. The electromagnetic actuator according to claim 1, wherein an end of the bobbin (2) opposite to the joint member (24) is connected to the coil (3). Coupler with terminal (34) (3
5) An electromagnetic actuator, comprising: 7. An electromagnetic actuator according to claim 6, wherein a coupler holding portion (41) fitted to the base of said coupler (35) is formed integrally with said coil cover (7a). Actuator.